Strengthening mechanisms in Monel K500 alloyed with Al and Ti

Monel alloys containing 63Ni–30Cu (wt%) are often used in applications requiring simultaneously high strength and corrosion resistance. Additions of Ti, Al and C to Monel K500 lead to formation of TiC, Ni 3 Al and Ni 3 Ti particles, which provide precipitation strengthening effect following heat tre...

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Bibliographic Details
Published in:Journal of materials science 2023-03, Vol.58 (9), p.4150-4164
Main Authors: Kostryzhev, A. G., Marenych, O. O., Pan, Z., Li, H., van Duin, S.
Format: Article
Language:English
Subjects:
Aging
Alloying
alloys
Aluminum
Annealing
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
corrosion
Corrosion resistance
Crystallography and Scattering Methods
energy
Grain growth
hardness
Heat treating
Heat treatment
Materials Science
Mechanical properties
Metals & Corrosion
Microstructure
Monel (trademark)
Nickel aluminides
Nickel base alloys
Optimization
Particle precipitation
Polymer Sciences
Precipitates
Precipitation hardening
Schedules
Solid Mechanics
solutes
Solution annealing
Strengthening
temperature
Titanium carbide
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Summary:Monel alloys containing 63Ni–30Cu (wt%) are often used in applications requiring simultaneously high strength and corrosion resistance. Additions of Ti, Al and C to Monel K500 lead to formation of TiC, Ni 3 Al and Ni 3 Ti particles, which provide precipitation strengthening effect following heat treatment. The traditional heat treatment schedule includes solution annealing above 1000 °C and aging in the 400–600 °C temperature range. However, no correlation exists between the alloy composition and the heat treatment schedule (holding temperature and time) required to obtain the optimum microstructure and mechanical properties. This may result in excessive alloying, energy loses during heat treatment, and higher product costs. In this work, we investigate the effect of solution annealing part of heat treatment schedule on microstructure (particularly, particle precipitation and grain growth), hardness and strength. For hot rolled samples, solution annealing followed by aging was shown to result in lower strength compared to aging without annealing. The analysis of strengthening mechanisms carried out utilising our theory for calculation of solute atom concentrations has explained the strength variation with heat treatment and has shown (i) a lower strength after annealing and aging being related to dissolution of fine (
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-023-08248-2